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Geography Markup Language (GML)

Geography Markup Language (GML). What is GML? – Scope. The Geography Markup Language is a modeling language for geographic information an encoding for geographic information designed for the web and web-based services. GML enables a vendor-neutral exchange of spatial data . GML. GIS X.

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Geography Markup Language (GML)

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  1. Geography Markup Language(GML)

  2. What is GML? – Scope • The Geography Markup Language is • a modeling language for geographic information • an encoding for geographic information • designed for the web and web-based services

  3. GML enables a vendor-neutral exchange of spatial data GML GIS X GIS Y Oracle File ...

  4. Characteristics GML • is based on XML technologies • XML, XML Namespaces, XML Schema, Xlinks • supports spatial and non-spatial properties of objects • is open and vendor-neutral • is extensible • supports the definition of profiles (proper subsets) of the full GML capabilities

  5. Characteristics GML • enables the creation and maintenance of linked geographic application schemas and datasets • increases the ability of organizations to share geographic application schemas and the information they describe • leaves it to implementers to decide whether application schemas and datasets are stored in native GML or whether GML is used only for schema and data transport

  6. GML Schemas, Application Schemas and Documents Use a schema language to model geographic information in a GML Application Schema and define rules for such schemas Define standard elements and types for use in application schemas  GML schemas Capture real-world objects as data conforming to a GML Application Schema  GML Documents

  7. GML Schemas • GML Schemas are horizontal and not focused on a specific application domain • But they can provide common constructs and concepts which may be used by all the different application domains

  8. Modelling Feature Types Road name I95 class Interstate centerLine gml:Curve maintainer DOT xyz Building an information community  reaching consensus about the vocabulary (feature types and their properties)

  9. Modelling Feature Types <Road gml:id="o.1f75dc"> <name>I95</name> <class>Interstate</class> <centerLine> <gml:Curve>...</gml:Curve> </centerLine> <maintainer>DOT xyz</maintainer> </Road>

  10. Modelling Feature Types Road name I95 class Interstate centerLine gml:Curve maintainer auth:Authority name xyz type DOT …

  11. Modelling Feature Types <Road gml:id="o.1f75dc"> <name>I95</name> <class>Interstate</class> <centerLine> <gml:Curve>...</gml:Curve> </centerLine> <maintainer> <auth:Authority gml:id=„o.1f32a3"> <name>xyz</name> <type>DOT</type> </auth:Authority> </maintainer> </Road>

  12. Roads Parcels Traffic Messages Administrative Boundaries Buildings Enabling the geospatial web • Information Communities publish their Application Schemas (preferably in some sort of registry) so that it can be found, accessed and understood by others • This enables that also the features can have properties whose values are maintained by other authorities  a web of geospatial features is created

  13. Web Feature Server Web Feature Server Web Feature Server Web XXX Server ... ... and use GML as the lingua franca of the geospatial web Standardized Service Interfaces Standardized Encoding GML Internet / Intranet Oracle XML DB File

  14. In summary • Provides a rich set of predefined types for Application Schemas • Has an underlying model that makes processing GML documents easier • Separates presentation and content • Works well in a Web Service environment • A building block of the Geospatial Web

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